On the Growth of Al_2 O_3 Scales - Heuer, AH; Nakagawa, T; Azar, MZ; Hovis, DB; Smialek, JL; Gleeson, B; Hine, NDM; Guhl, H; Lee, H-S; Tangney, P; Foulkes, WMC; Finnis, MW (Acta Materialia, 2013)